Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Reexamination Certificate
2008-01-08
2008-01-08
Hjerpe, Richard (Department: 2629)
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
C345S098000, C345S099000, C345S100000, C345S211000
Reexamination Certificate
active
10640281
ABSTRACT:
Provided are a circuit and method for driving a liquid crystal display device using low power. The circuit includes a display data latch, a gamma decoder, and a driver cell circuit. The display data latch latches display data from a memory. The gamma decoder receives a plurality of gray scale voltages, and selects and outputs one of the plurality of gray scale voltages in response to the display data. The driver cell circuit receives an output voltage of the gamma decoder and generates an output voltage applied to the liquid crystal display device. The driver cell circuit controls a slew rate in response to comparison result of current data and previous data of the display data. The driver cell circuit includes a previous data latch, a bias control voltage generator, and a driver amplifier. The previous data latch receives a portion or the whole of the display data and outputs the portion or the whole of the display data as the previous data. The bias control voltage generator compares the current data and the previous data of the display data and generates a control signal. The driver amplifier receives the output voltage of the gamma decoder, generates the output voltage applied to the liquid crystal display device, and controls the slew rate in response to the control signal.
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Beck Alexander S.
Hjerpe Richard
Mills & Onello. LLP
Samsung Electronics Co,. Ltd.
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